(a)250 kg of water at 1 bar and 35°C is turned into wet steam at 7...

(a)250 kg of water at 1 bar and 35°C is turned into wet steam at 7 bar (x = 0.95). Given at 1 bar hf = 417 kJ/kg, hfg = 2258 kJ/kg, Tsat = 100°C and at 7 bar hf = 697 kJ/kg, hfg = 2067 kJ/kg, Tsat = 165°C. Determine the energy required.

(b)Determine the mass of dry saturated steam at 1 bar that must be added to 500 kg of water at 20°C to achieve a final water temperature of 45°C. Given; hf = 417 kJ/kg, hfg = 2258 kJ/kg. Tsat = 100°C.

Expert Solution

Assume subcooled liquid is incompressible liquid and take specific heat as 4.2 Kj/kg-k.

samet mamat answered 8 months ago

Q3. 5 kg of water at T = 20° C and P = 7 bar is...

Q3. 5 kg of water at T = 20° C and P = 7 bar is isobarically heated such that ΔU = 5000 kJ. (i) Find the initial and final volumes (in m3 ). (ii) Find Q and W (in kJ). (iii) Show the initial and final states on p-υ and T-υ diagrams (not to scale), denoting by arrows the direction of the process. Label the ‘f’ (saturated liquid) and ‘g’ (saturated vapor) points. Also, indicate the values of υf...

Steam at 100 °C is bubbled into 2.70 kg of water at 25 °C in a...

Steam at 100 °C is bubbled into 2.70 kg of water at 25 °C in a calorimeter cup. How much steam will have been added when the water in the cup reaches 55 °C? (Ignore the effect of the cup.)

During isobaric process m=64 kg of wet water stream at temperature t=262.7?C and pressure p=49 bar...

During isobaric process m=64 kg of wet water stream at temperature t=262.7?C and pressure p=49 bar changed its specific volume from v1 =0.0018 m3/kg to v2=0.035 m3/kg. Find initial and final quality of steam, change of internal energy of steam, work done by steam, amount of heat exchanged with surroundings. Draw the process at the enthalpy-entropy diagram. From tables for p=49 bar: v’=0.0013 m3/kg, v”=0.0403 m3/kg, h’= 1148.4 KJ/kg, h”= 2794.7 KJ/kg

3 Kg mass of water is heated to a temperature of 99.5 C at 1 bar...

3 Kg mass of water is heated to a temperature of 99.5 C at 1 bar of pressure. It is slowly poured into a heavily insulated beaker containing 7.5 Kg of water at a temperature and pressure of 4 C, 1 bar, respectively. The specific heat of the water, an incompressible material is, c = 4.1 KJ/(Kg K). The beaker can be considered to be an adiabatic system. The two water mass’ reach an equilibrium temperature. There is no kinetic...

Inside a piston cylinder, there is wet steam at a temperature of 6 kg at a...

Inside a piston cylinder, there is wet steam at a temperature of 6 kg at a temperature of 120 °C and 0.6 dryness. The steam in this reciprocating cylinder is given 120 kj of heat from the outside. In addition, 25 kj of work is done by a propeller in the steam in the cylinder. As it is known that the process takes place at constant pressure and in the second case, the temperature is 200 °C; a) Show the...

A 10.0 m3 tank contains steam at 250°C and 10.0 bar. The tank and its contents...

A 10.0 m3 tank contains steam at 250°C and 10.0 bar. The tank and its contents are cooled until the pressure drops to 1.8 bar. Some of the steam condenses in the process. (a) How much heat was transferred from the tank? (b) What is the final temperature of the tank contents? (c) How much steam condensed (kg)?

A rigid, well-insulated tank contains wet steam (20:80 wt% liquid:vapor) at 200 ◦C. The wet steam...

A rigid, well-insulated tank contains wet steam (20:80 wt% liquid:vapor) at 200 ◦C. The wet steam is withdrawn from the tank until the ﬂuid remaining in the tank is at 150 ◦C. The process is carried out slowlysuchthatinternalgradientsarenegligibleinsidethetank. Determineattheendofthisprocess: (a) The pressure in the tank. (b) The mass fraction of vapor and liquid in the tank. (c) The fraction of total water (liquid and vapor) present initially that was withdrawn

A rigid, well-insulated tank contains wet steam (20:80 wt% liquid:vapor) at 200◦C. The wet steam is...

A rigid, well-insulated tank contains wet steam (20:80 wt% liquid:vapor) at 200◦C. The wet steam is withdrawn from the tank until the fluid remaining in the tank is at 150◦C. The process is carried out slowly such that internal gradients are negligible inside the tank. Determine at the end of this process: (a) The pressure in the tank. (b) The mass fraction of vapor and liquid in the tank. (c) The fraction of total water (liquid and vapor) present initially...

3. An insulated container contains 2.7 kg of steam at 1.4 bar and 120°C. The top...

3. An insulated container contains 2.7 kg of steam at 1.4 bar and 120°C. The top is opened and a 1.8 kg block of ice at 0°C and 4.5 kg of liquid water at 1.6°C are dumped into the container. What is the final temperature of the resulting vapor-liquid mixture in the container? Note: It takes 6.0095 KJ/mol to melt ice.

Estimate the following: The volume occupied by 18 kg of ethylene at 55°C and 35 bar....

Estimate the following: The volume occupied by 18 kg of ethylene at 55°C and 35 bar. The mass of ethylene contained in a 0.25-m3 cylinder at 50°C and 115 bar.

Question